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I think SEI supplies the lower unit for Sierra brand, but not sure.----Sierra lists at about $2400 I think.

I can not see or hear your motor.----I can only go by information posted here by you.----.-----Fact for you to consider , fuel goes to the enricher from the carburetor bowl.----This fuel bypasses the jets and metering circuits inside the carburetor.-----Perhaps take the carburetor to a shop for...

The term " good compression " means nothing.-----What are the actual values.-----It is amazing to me how many folks are willing guess , and spend hundreds of beer tokens on coils , stators , switch boxes.----Yet are scared to spend a few dollars on head gaskets to ensure cylinders are in good...

These units typically strip teeth off the gears.-----That new price is aftermarket ( chinesium parts ) I think .-----New from factory was a lot more when available.-----These lower units are not robust in my opinion.------A lower unit from 93 and newer fits.-----From 40 / 48 / 50 HP 2 cylinder...

The solenoid is used for UP only.-----For DOWN the current is lower and solenoid is not used.

Take a look at the seal kit for a 1978 model 70 HP.----Might be a good / close fit.

They did not market kits back then.----You have to order all separately.

Your location

Find the issue with the wires.-----Doubt you have bad relays.

Sounds like it might be running on 1 cylinder at times.----Does spark jump a gap of 3/8" or better on a test device.----Sparkplugs are NOT used during this maximum output test.

Need to ask.-----Did you just put gas in it and then took it to the lake ?-----Any service work / inspection done by you ?-----Tested the oil injection system ?----Your first boat ?

Revisit the carburetor cleaning.

If folks have a good 40 year old motor to do some fishing / cruising in your area, why would they sell it ??----Most new motors also require 100+ / hr dealer support.----

This " POP " is a lean sneeze I think.-----So do you think that occurs in the crankcase ?----In the cylinder ?----In the exhaust manifold ?

Are you pushing key in WHILE cranking it over ?-----Is the ENRICHER solenoid working ?----Remove sparkplugs, put a little fuel into into each cylinder.----Install plugs and crank it over.----Report what happens.

They do not do a lot of boating in January in New York state.-------So a 40 year old , fresh water motor from that area could be a great deal.-----Might be a better motor than a 5 year old Florida , salt water motor.

On a 2 stroke you need to make sure that carburetors are clean.----Blockages may starve a cylinder of oil.-----Run with a timing light to see if one or more cylinders lose spark.

Fuel dripping below throttle shafts is normal after motor stops !!!

Did a 59 model 5.5 HP for the grandson-----Installed a brand new factory 6 hp crankshaft along with newer rods with needle bearings.-----If you approach this job the right way it will be a sweet runner.----Cheaper to own than some new motors.

The high speed mixture is NOT adjustable on these carburetors !-----Open the low speed mixture screws 1/8th turn at a time.-----Often the bogging will go away.